Pivot arm lock



3Q, 1936. J. LINILSONI 2,045,953

PIVOT ARM LOCK Filed Jan. 25, 1956 INVENTOR. John L. Nilson' W ATTORNEY.

Patented June 30, 1936 UNITED STATES PATENT OFFICE 2,045,958 PIVOT ARM LOCK John L. Nilson, Chicago, 111. Application January 25, 1936, Serial No. 60,829 4 Claims. (01. 15-120) a pivot arm which after its insertion into the handle will not only pivot but by the pivoting itself will lock the pivot arm against displacement from the handle, and such other objects, advantages and capabilities as will later more fully appear and which are inherently possessed by my invention.

While I have shown in the accompanying drawing a preferred embodiment of my invention yet I wish it understood that the same is susceptible of modification and change without departing from the spirit of my invention.

Referring more particularly to the drawing, Fig. 1 is a front elevational view of my pivot arm lock used in a wringer mop; Fig. 2 is a detailed view of the pivot arm structure; Fig. 3 is a sectional view of the pivot arm attached to the handle; and Fig. 4 is a detailed view of the interior of the handle, showing the circumferential grooves formed by the keys of the pivot arm; Fig. 5 is a detailed view of another embodiment of my pivot arm structure eliminating one of the parallel portions.

My wringer mop with which my pivot arm lock is used comprises an elongated handle ID, a pivot arm structure H, a wringing mechanism l2, a swab holder l3 connected to the bottom of the handle Ill and a swab l4 extending between the holder I3 and the wringing mechanism I 2.

Referring more particularly to my pivot arm structure I i, it comprises a pivot arm l5 pivoted transversely to the axis of said handle 10 to swing toward and away from said handle and bent substantially at a right angle to form a bearing It for a U shaped member I! of the wringing mechanism [2.

My pivot arm I5 is shown in the drawing as a loop having a pair of substantially parallel side portions 2| and 22. A bottom portion l6 of said loop formed substantially at right angles to said parallel portions acts as a bearing for the U shaped member ll. Substantially opposite said bottom portion I6 is a top portion l8 formed substantially at a right angle to said side parallel portions to form a pair of inturned portions 23 and 24. Adjacent the end of each inturned portion 23 and 24 is a laterally extending key 26 preferably formed integral with said inturned portions. The inturned portions 23 and 24 and keys 26 are adapted to fit into a hole 25 and keyway 21 on either side of the handle l and thus pivot the pivot arm l to the handle l0. Since the keys 26 are preferably of harder material than the interior of the handle lil, upon the first turn of the pivot arm the keys will form their own ways, seats or circumferential grooves 28, and thus prevent the pivot arm from displacement. Since the pivot arm is normally held in a restricted position with respect to said handle I0 by the swab l4, attached to the wringing mechanism l2, the grooves 28 act to hold the pivot arm against displacement in normal position. If, however, the pivot arm is released from its normal position by releasing the swab M the pivot arm can then be swung back on the handle it so as to carry it out of the range of said grooves 28 and the inturned portions 23 and 24 maybe pulled away from said handle l0.

While I have shown in the drawing that my pivot arm l5 has a pair of substantially parallel portions 2| and 22 yet it is obvious that the second parallel portion 22 may be eliminated and a nut or other means fastened to the end of the bent over portion or bearing l6 of the pivot arm I 5 to prevent dislodgement of the U shaped member l1. With my pivot arm constructed in this manner the single key of the pivot arm will act to hold the pivot arm in the handle and. prevent the pivot arm from displacement from the handle.

My patent, No.2,018,413, of October 22, 1935 shows and claims a torque arm construction, a wringing mechanism, a ratchet and a selector. My copending application, Serial Number 32,525, claims a torque arm construction in which the retaining rod is slidable with respect to the handle. My copending application, Serial Number 60,830, relates to a combination wringing mechanism and swab holder lock for wringer mops. My copending application, Serial Number 45,298, relates to a torque arm structure for holding the wringing mechanism and the swab in fixed wringing position.

My present invention herein is new and different from the above patent and. copending applications in that in this case I disclose a pivot arm lock for wringer mops not shown, described or claimed in my previous patent and applications.

Having thus described my invention, I claim:

1. A pivot arm lock comprising an elongated handle having a hole and a keyway, a pivot arm, said pivot arm having a pair of substantially parallel side portions joined by a bottom portion, said side portions bent inwardly at substantially right angles to form a pair of inturned portions,

said inturned portions each having adjacent its end a laterally extending key, said inturned portions and said keys adapted to fit within said hole and keyway, said keys being of harder material than the interior of said handle so that upon pivoting of said pivot arm in said handle the keys form circumferential grooves within said handle so as to prevent the pivot arm from displacement with respect to said handle.

2. A pivot arm look comprising an elongated handle havinga hole and a keyway, a pivot arm, said pivot arm having a pair of substantially par allel side portions joined by a bottom portion, 7 said side portions bent inwardly at substantially right angles to form a pair of inturned portions, said inturned portions each having adjacent its end a laterally extending key, said inturned portions and said keys adapted to fit within said hole and keyway, said keys being of harder material than the interior of said handle so that upon pivoting of said pivot arm in said handle the keys form circumferential grooves within said handle so as to prevent the pivot arm from displacement with respect to said handle, when said pivot arm is in normal position, but when said pivot arm is released from normal position and bent back on said handle said keys being then withdrawn from the range of the circumferential grooves will then permit the withdrawal of the inturned portions from said handle.

,3. A pivot arm lock comprising an elongated handle having a hole and a keyway, a pivot arm, said pivot arm having a side portion continuing to form a bottom portion on one end and continuing on the other end substantially at a right angle to form an inturned portion, said inturned portion having adjacent its end a laterally extending key, said inturned portion and said key adapted to fit within said hole and keyway, said key being of harder material than the interior of said handle so that upon pivoting of said pivot arm in said handle the key forms a circumferential groove within said handle so as to prevent the pivot arm from displacement with respect to said handle.

4. A pivot arm lock comprising an elongated handle having a hole and a keyway, a pivot arm, said pivot arm having a side portion continuing to form a bottom portion on one end and cone tinuing on the other end substantially at a right angle'to form an inturned portion, said inturned portion having adjacent its end a laterally extending key, said inturned portion and said key adapted to fit within said hole and keyway, said key being of harder material than the interior of said handle so that upon pivoting of said pivot arm in said handle the key forms a circumferential groove within said handle so as to prevent the pivot arm from displacement with respect to said handle when said pivot arm isin normal position, but when said pivotarm is released from normal positionand bent back on said handle said key being then withdrawn from the range of the circumferential groove will then permit the withdrawal of the inturned portion from said handle. 7

, JOHN L. NILSON. 

